Top Gear personality James May takes the GM Hy-Wire concept out for a road test. This vehicle is touted as the first drivable concept to combine a hydrogen fuel cell with by-wire technology. On the inside, you'll find "a single unit called X-drive that is easily set to either a left or right driving position" -- allowing steering, braking, and other functions to be controlled electronically rather than mechanically. Video clip after the jump.